type I secretion system ABC transporter, HlyB family
Type I protein secretion is a system in some Gram-negative bacteria to export proteins (often proteases) across both inner and outer membranes to the extracellular medium. This is one of three proteins of the type I secretion apparatus. Targeted proteins are not cleaved at the N-terminus, but rather carry signals located toward the extreme C-terminus to direct type I secretion. [Protein fate, Protein and peptide secretion and trafficking]
Jiyao W et al.(2023). "The conserved domain database in 2023.",